[PSUBS-MAILIST] Thruster

[Alan James via Personal_Submersibles]

Rick, the only way the water can get in to the system is through the exhaust valve or the thruster seal. I put extensions on the exhaust valve so that while exhausting no water could creep in. If they opened due to a venturi effect while towing, then you could get water coming in, but it would pressurize the air in the system up the tube which would prevent it going too high. However I guess if you then turned the air on it may force the water that got in up the tube. I always had the air on before I got in the water & didnt notice any bubbles other than in the exhaust faze.  But I wasnt towing.  You could experiment & hang a regulator on a pole off a boat travelling at towing speed.This is a bit of a motivation for me to get my system finished. Alan

Sent from Yahoo Mail on Android 
 
  On Wed, 8 Feb 2023 at 12:01 pm, Rick Patton via Personal_Submersibles<personal_submersibles at psubs.org> wrote:   Alan, My second stage is located as low as possible but Alec has the same exact "I followed his design" system and he said that he had gotten some water in the thrusters as well as the accuators, plus I was thinking that the force of water being as dense as it is would force it's way down the tube as the water burbles over and around the mouth piece and there is no resistance in the lines or housings to prevent that as they are at one atm.
Rick
On Tue, Feb 7, 2023 at 12:26 PM Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Rick,I thought you said that your second stage regulator was lower than your thrusters. How is the water going to get in to them? The exhaust valves on the second stage should keep the water out of the system; however I did add an extension to the exhaust port on mine, just to make sure.I have advised at various times to use octopus regulators that are less prone to free flowing.One problem I can see is that the exhaust valves may suck open with the water flowing past them while towing. But even if they did, with the thrusters higher than the regulator you shouldn't get any water in.However I am building a better over-pressure system.Alan

Sent from Yahoo Mail on Android 
 
  On Wed, 8 Feb 2023 at 11:07 am, Rick Patton via Personal_Submersibles<personal_submersibles at psubs.org> wrote:   _______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
  
_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20230207/526dfd93/attachment.html>